Stronger quantum correlations with loophole-free postselection.
Stronger quantum correlations with loophole-free postselection.
复制标题
更强的量子相关性和无漏洞的后选择。
DOI：
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发表时间：
2011
影响因子：
8.6
通讯作者：
D. Browne
中科院分区：
文献类型：
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作者：
M. Hoban;D. Browne
量子力学最显著的非经典特征之一是它预测的空间分离测量之间的相关性。在局部隐变量理论中，相关性受到贝尔不等式的约束，但量子相关性违反了这些。然而，实验的不完善导致漏洞，使LHV相关不再受贝尔不等式的约束，违反可以描述的LHV理论。例如，通过选择性地检测事件可能会出现漏洞。在这封信中，我们介绍了一个干净的，可操作的图片多方贝尔测试，并表明存在一个非平凡的形式的无漏洞后选择。令人惊讶的是，同样的后选择可以增强量子相关性，并解开非经典相关性和非经典计算之间的联系。
One of the most striking nonclassical features of quantum mechanics is in the correlations it predicts between spatially separated measurements. In local hidden variable theories, correlations are constrained by Bell inequalities, but quantum correlations violate these. However, experimental imperfections lead to loopholes whereby LHV correlations are no longer constrained by Bell inequalities, and violations can be described by LHV theories. For example, loopholes can emerge through selective detection of events. In this Letter, we introduce a clean, operational picture of multiparty Bell tests, and show that there exists a nontrivial form of loophole-free postselection. Surprisingly, the same postselection can enhance quantum correlations, and unlock a connection between nonclassical correlations and nonclassical computation.